A.S. Lok is supported in part by a grant from the National Institutes of Health U01 DK082863, the Tuktawa Foundation, and the CK Hui Memorial Fund.

Potential conflict of interest: Dr. Lok has received research grants from Bristol-Myers Squibb, Gilead, and Merck, and has served on advisory panels for Gilead and GlaxoSmithKline. She consults for Merck.